diff --git a/CHANGELOG.md b/CHANGELOG.md
index 578ceec1..1ba99ed2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 ## 3.0.6 (release date: TBD)
   * Upgraded to Ruby 3.1.6
-  * Upgraded to Ruby 3.3.2
+  * Upgraded to Ruby 3.3.3
 
 ## 3.0.5 (release date: 2024-05-18)
  * Removed Ruby 3.0 (EOL: 2024-04-23)
diff --git a/README.md b/README.md
index 92060529..31e04a9d 100644
--- a/README.md
+++ b/README.md
@@ -94,9 +94,9 @@ Basics (learn more at [baseimage-docker](http://phusion.github.io/baseimage-dock
 
 Language support:
 
- * Ruby 3.1.6, 3.2.4, 3.3.2 and JRuby 9.3.14.0 and 9.4.6.0.
+ * Ruby 3.1.6, 3.2.4, 3.3.3 and JRuby 9.3.14.0 and 9.4.6.0.
    * RVM is used to manage Ruby versions. [Why RVM?](#why_rvm)
-   * 3.3.2 is configured as the default.
+   * 3.3.3 is configured as the default.
    * JRuby is installed from source, but we register an APT entry for it.
    * JRuby uses OpenJDK 17.
  * Python 2.7 or 3.10, or any version provided by the Deadsnakes PPA (currently 3.7, 3.8, 3.9, 3.11, and 3.12; see https://launchpad.net/~deadsnakes/+archive/ubuntu/ppa).
@@ -451,8 +451,8 @@ The default Ruby (what the `/usr/bin/ruby` command executes) is the latest Ruby
 RUN bash -lc 'rvm --default use ruby-3.1.6'
 # Ruby 3.2.4
 RUN bash -lc 'rvm --default use ruby-3.2.4'
-# Ruby 3.3.2
-RUN bash -lc 'rvm --default use ruby-3.3.2'
+# Ruby 3.3.3
+RUN bash -lc 'rvm --default use ruby-3.3.3'
 # JRuby 9.3.14.0
 RUN bash -lc 'rvm --default use jruby-9.3.14.0'
 # JRuby 9.4.6.0
@@ -471,16 +471,16 @@ $ rvm-exec 3.1.6 ruby -v
 Using /usr/local/rvm/gems/ruby-3.1.6
 ruby 3.1.6p260 (2024-05-29 revision a777087be6) [x86_64-linux]
 
-$ rvm-exec 3.3.2 ruby -v
-Using /usr/local/rvm/gems/ruby-3.3.2
-ruby 3.3.2 (2024-05-30 revision e5a195edf6) [x86_64-linux]
+$ rvm-exec 3.3.3 ruby -v
+Using /usr/local/rvm/gems/ruby-3.3.3
+ruby 3.3.3 (2024-06-12 revision f1c7b6f435) [x86_64-linux]
 ```
 
 More examples, but with Bundler instead:
 
 ```bash
-# This runs 'bundle install' using Ruby 3.3.2
-rvm-exec 3.3.2 bundle install
+# This runs 'bundle install' using Ruby 3.3.3
+rvm-exec 3.3.3 bundle install
 ```
 
 <a name="default_ruby_wrapper_scripts"></a>
diff --git a/image/nginx-passenger.sh b/image/nginx-passenger.sh
index 95c777a3..1ae4c462 100755
--- a/image/nginx-passenger.sh
+++ b/image/nginx-passenger.sh
@@ -9,7 +9,7 @@ header "Installing Phusion Passenger..."
 ## Install it through RVM, not APT, so that the -customizable variant cannot end up
 ## having Ruby installed from both APT and RVM.
 if [[ ! -e /usr/bin/ruby ]]; then
-	RVM_ID="ruby-3.3.2"
+	RVM_ID="ruby-3.3.3"
 
 	run mkdir -p "/build_cache/${ARCH}"
 	if [[ -e "/build_cache/${ARCH}/${RVM_ID}.tar.bz2" ]]; then
diff --git a/image/ruby-3.3.2.sh b/image/ruby-3.3.3.sh
similarity index 100%
rename from image/ruby-3.3.2.sh
rename to image/ruby-3.3.3.sh